Analysis And Design Of UAV Aerial Survey Based On PPK Differential Technology

In recent years,with the development of drone technology and digital cameras,the UAV aerial survey system is fast and efficient in high-resolution images in small areas and complex areas of the earth,with its accurate and efficient mapping,low operating cost and wide application range.Aspects have obvious advantages.In order to obtain high-precision and large-scale topographic map of 1:500,the pre-data acquisition of the UAV aerial survey system requires a large number of image control points and control points to be edited,which is labor-intensive and timeconsuming,especially in complex areas.In the remote areas of the west.By satellite positioning technology to calculate the precise position of the photo center of the photographing moment,and at the same time,taking the orientation data of the image of the unmanned aerial vehicle system to obtain the orientation element of the photo,it can reduce the ground image control point layout work by more than 90%,and even eliminate the need to lay out the image control point.It is possible to complete the production of a 1:500 scale topographic map,which greatly improves production efficiency.In this paper,PPK(Post Processing Kinetic)differential technology is combined with the AHRS(Attitude and Heading Reference System)of the drone to obtain the spatial position of the aerial photo,and the phasefree control is performed.The analysis and design of the aircraft aerial survey system solves the problem of a large number of field surveying and internal editing work in the 1:500 large scale mapping operation,and realizes the design of the large-scale phase-free phase-controlled drone aerial survey system.system.Specifically,the main content of this article includes the following three aspects:Firstly,the basic composition and principle of the UAV aerial survey system are analyzed,as well as the related GNSS differential positioning technology: RTK(Real-Time Kinematic)technology and PPK(Post Processing Kinetic)technology.Secondly,through the analysis of the main factors causing the accuracy of the current UAV aerial survey system in the large-scale surveying and mapping process,the PPK differential technology is combined with the external flash signal of the aerial camera and the AHRS of the drone to complete 1:500.Proportional UAV aerial survey system design.Then,based on the overall design scheme of the above-mentioned UAV aerial survey system,the detailed hardware design of the UAV aerial survey system and the software detailed design are completed,and the complete design of the drone survey system based on PPK differential technology is finally completed.Finally,a 1:500 scale topographic map production experiment was conducted in accordance with the drone aerial survey operation specifications.The results show that the UAV aerial survey system based on PPK differential technology can complete the 1:500 large-scale topographic map without setting the image control points or setting up few image control points,verification of technical feasibility and superiority,it provides new ideas and references for the design of large-scale low-altitude aerial survey systems.